Based On Wdm And Ocdm Optical Packet Network Performance

Due to the capability of all-optical signal processing, optical code division multiplexing (OCDM) is regarded as one of the most promising technologies to realize all-optical communication. It is to the optical packet switch network's advantage to adopt the OCDM technology and wavelength division multiplexing (WDM) technology. Our group brought out the hybrid WDM and OCDM optical packet switched network. In this thesis, our research concentrates on the network bit error rate (BER) and the network blocking probability (PB). The details of the research result are listed as follow:1. We proposed a more accurate method of calculating Bit Error Rate (BER) of bipolar system. The tradition methods of calculating system BER are Gaussian Approximation (GA) method, non-Gaussian Approximation (NGA) method, Poisson approximation, etc. Because of these methods'shortage, we proposed a new calculation method in which the impact of input light polarization state is considered. Both interference users parallel and upright with the targeted signal are discussed, derived the upper and lower bound of the BER performance. In fact, the interference user is random polarization, so the actual BER ranged between the upper and lower limits.2. Based on the number of Wavelength converter (WC) and Label Converter (LC), the network Blocking Probability (BP) performance was analyzed. We derived the network calculation formula and the optimal WC and LC configuration scheme. Fist of all, we set up a mathematical model to calculate the network BP performance. And then we discussed the network BP calculation formula with different numbers of WC and LC. By the numerical simulation, results of the network BP performance were compared. With the same parameters, when all nodes of the network were configured WC and LC, the BP was the lowest; and when all nodes of the network were not configured WC and LC, the BP was the highest. When the number of WC was invariable, the BP was decreased with the number increasing of LC; when the wavelength path (WP) was less and the label path (LP) was more, the network BP was higher; it was because that the label utilization rate was not high in every WP. Because the WC was more expensive, we discussed the sparse placement algorithm of WCs. Simulation results indicated that the network blocking rate decreased with WC placement density increasing.3. An ameliorated Label Distribution Protocol (LDP) was proposed. We analyzed the LDP which was proposed, and found the inadequacies still existed, so we ameliorated the LDP by adding a new variable, which can reduce the users interferences. The simulation results indicated that the new LDP was superior to LDP proposed at the System Throughput (ST) and network average packet delay.